Symptoms people commonly track

Why symptoms are worth tracking

Thyroid conditions can produce symptoms that come and go, shift gradually, or get written off as stress or ageing. Because so many things can feel "a bit off" at once, it's easy to forget what was happening three months ago - or to underplay things when you're sitting in a consulting room. A simple log gives you something concrete to bring.

This page describes the kinds of things people commonly monitor. None of this is diagnostic - symptoms overlap with many conditions and only your clinician can interpret them in context. The aim is to help you notice patterns and describe them clearly.

Energy and fatigue

Fatigue is one of the most commonly reported thyroid symptoms, whether the thyroid is underactive or overactive. People track:

• how tired they feel in the morning versus the afternoon
• whether tiredness improves with rest, or doesn't shift at all
• days when they felt unusually flat or unable to concentrate

Mood and mental state

Mood changes are common - and easy to dismiss as just "being anxious" or "feeling low". Some things worth noting:

• episodes of anxiety, restlessness or difficulty settling
• low mood, emotional flatness or tearfulness
• difficulty concentrating or word-finding
• brain fog - that sensation of thinking through cotton wool

Heart rate and palpitations

An overactive thyroid (hyperthyroidism) can cause a faster or irregular heartbeat. An underactive thyroid can sometimes cause a slower one. People track:

• resting heart rate (your phone, watch, or a simple pulse check)
• episodes of palpitations - a fluttery or racing sensation in the chest
• heart rate variability if they use a wearable device

If you experience chest pain, a very fast or very irregular heartbeat, or feel faint, seek medical help promptly rather than logging and waiting - see when to seek urgent help.

Temperature and cold or heat tolerance

Feeling unusually cold all the time is a classic feature of an underactive thyroid. Feeling too warm, or sweating more than usual, is more common with an overactive thyroid. People track:

• whether they feel cold when others don't
• excessive sweating, especially at rest or at night
• changes in their thermostat habits at home

Sleep

Both too little thyroid hormone and too much can disturb sleep, in different ways. It's worth noting:

• difficulty getting off to sleep, or waking in the early hours
• sleeping much more than usual but still feeling unrefreshed
• vivid dreams or night sweats

Weight

Weight changes are common but also influenced by many factors beyond the thyroid. Tracking weight as one data point - not the whole picture - can be useful. People note:

• unexpected weight gain despite no change in diet or activity
• unexplained weight loss
• changes in appetite

Tremor

A fine tremor - a slight shakiness in the hands or fingers - is a feature some people notice, particularly with an overactive thyroid. Tracking when it happens (morning vs afternoon, before or after medication) can be helpful information for your clinician.

Bowel habits

Thyroid hormones affect gut motility. Constipation is often linked with underactive thyroid; looser stools or urgency can be associated with overactive thyroid. Changes from your personal normal are worth noting.

Menstrual cycle

For people who menstruate, thyroid conditions can affect cycle regularity, flow and symptoms. Heavier periods, irregular cycles, or significant premenstrual changes are all things some people track alongside their other thyroid symptoms.

What to do with what you notice

The symptom tracker on this site helps you log these things consistently over time. A pattern across a few weeks is much more useful to your clinician than a long list of things that might have happened. Bring your log to appointments - see preparing for appointments for how to use it.

Tracking is a way of being a more informed participant in your own care - not a substitute for medical assessment. If you're unsure whether something you're experiencing is serious, always speak to your GP or clinician.